Sounds like it’s clear in your mind what you want to happen, but I’ve heard plenty of people say, “Of course you took it somewhere else, that’s what I told you to do, and now I have two action-less emails to trash rather than one.”
Thank you for your email! I am on vacation. Vacations are not for checking email, so I won’t be doing that. Fortunately, we rarely encounter life and death situations in the world of [INDUSTRY TYPE], and aren’t we all glad for that? If you think I’m checking email because you just received an email from me, that is only because I figured out the pixies that send emails on a schedule. Really, I’m not checking email.

Yes, mine (for external e-mails) typically says somethingalong the lines of “I’m out of the office until [date/time] and messages to this address are not monitored in my absence. I will respond as soon as possible on my return. If your message is urgent, please re-send to my assistant [email address] or telephone [assistant’s number]” Internal it will usually just say “I’m out until [date/time] pass any urgent enquiries to [co-workers] ” although my assistant and a couple of others have my home number and personal e-mail so can get hold of me in a genuine emergency, and I will sometimes speak to them in advance if I’m willing to lower the bar on what amounts to an emergency, but I would not expect any of my employees to do that !
In the top right corner, click the cog icon to open Outlook settings, then click “View all Outlook Settings.”